There are many discussions about the iPad camera on this Forum so please feel free to have a look at them. The iPad's rear camera has approximately 1 Mpixel resolution compared to the iPhone's 5 Mpixel camera. It was intended for HD video applications and not, primarily, for still pictures. The resolution of the camera is the same on all iPad2s - it's not related in any way to whether it's a 3G version of the iPad.
Tim